Larry Cable

juanpablo046

I'd be checking the setup and condition of the mounts and suspension components. If you go for a complete alignment, corner weight and rake check up they should be also checking every wear or sensible component.

These cars are very stable and easy to drive with factory setup and in good condition, even modern Cup 2s are not perfect are still very safe tires so I'd be thinking something is wrong.

Even with my GT2 RS I'd have no issue or concern having a friend or my wife driving full throttle with some warming up on the tires, no worry at all.

PHX

Quote of the year, right there.

josephvman

Stock wheel/tire sizes? That’s crazy, 991.2 is such a predictable car. Hope your girlfriend makes a full recovery.

strato58

My money is on its not the car its the driver.

thebishman

The C7 Z06 was the first Corvette variant that had adjustable rear caster, and many cars were leaving the factory with it far off the norm. Many complaints of instability when driving, and actual crashes involving getting on the throttle in decent conditions and the rear just snapping around uncontrollably. It really seems that your alignment settings being well off would be the primary cause.

dwe8922

I've always enjoyed the cup 2 on the street.... Even if you were a really bad driver, I wouldn't think mild acceleration in a straight line, with a pavement change would cause the rear end to let go. Tires I wouln't think so either, or else they'd do it in other situations. My first guess would be some kind of alignment issue like the toe. Next I would question a glitch in the rear steer being a .2; that or an sc error where it grossly mis-read the surface change and made some big corresponding change. My rear steer would upset the rear on one big sweeper near my house that had a big expansion joint in it. It would consistenly do it there if I was pushing it, but that was the only place I ever felt that. Let us know if they find anything.

2swoosh

do forensic on your suspension if you still have access to it. gt3 doesn't have enough power to behave like that on a straight line

ninefiveone

Cup2 R’s. Not Cup2’s

It’s understandable that folks don’t know how track tires behave. It’s not exactly a common experience.

Track tires aren’t “as good as street tires when cold but really good hot.”

Track tires are absolutely terrible cold and you don’t get them anywhere near hot driving on the street.

Why anyone would drive Cup2 R’s on the street without being extra cautious…

The conditions described here are exactly why you don’t do that.

Wangracing

I drive my cars solely on track tires on the street as its tracked regularly enough to make it not worth the hassle of regular wheel changes. You may not get them "hot" on the street but you definitely get enough temperature into them to offer grip at least as good as a normal street tire on a dry road. Yes they can tramline a little more but its not dangerous or out of control. The only times I have had a tire contribute to a control issue is mismatched brands front and rear and tires that were very worn. Outside of that i'd say its far more about the cars geometry or maybe there was something spilt on the road. Its just not typical behavior for these cars to do that. I've also found the electronic talent in these cars really effective at catching slides. Its really hard to understand how the car got so far away from the driver with all the nannies turned on.

Marv

That almost sounds like a sudden tire failure, but anything could have started a cascade of faults.

I agree with WangRacing. Hard to understand how that happens in a steady state condition, TC or not, but I wasn't there.

wootloops

Agreed. I track my cars frequently, without trailering them and I have on average a 1.5-2 hour drive to and from the track. I've run numerous track tires and have never had an issue with straight line grip especially in the summer, unless it was raining.

Some of you guys are really overhyping the Cup2R part of this crash. They are DOT approved street legal tires that come on a number of cars from the factory. If they were responsible for cars going from straight line acceleration to randomly spinning in a circle, there would be lawsuits left and right. We're not talking about Hoosier slicks on a winter morning.

911dude41

Driven to and from Vegas enough to know exactly what you're talking about. The highways suck. Getting on the 215 from Las Vegas Boulevard by the airport there are dangerous sections of slippery grooved road on a curve while it's merging.

I've driven everything from A-Z on that section (rental cars economy cars, SUV's and personal sports cars). It's like driving on soapy glass. Rear ends typically slip out. We've had a long running joke that this is done on purpose to wipe out cars that have robbed a casino and on the run.

Manifold

Sorry to hear about this. Hope you both make full recovery physically and mentally.

I don’t think this was driver error, something was majorly and unusually wrong with the car. Could be PSM, RWS, e-diff or some other problem. I doubt it was the tires.

Anyone who never hits 90 mph on public roads in a GT car needs to sell the car and buy something slow.

tgibrit

I certainly don't buy the tire theory, especially as the OP states they were barely accelerating, I also don't buy there was an alignment issue bad enough to unexpectedly pitch the car sideways that the OP wasn't aware of with 20yrs racing experience. IMO there is more to this story. which I understand (having gone off at the track and comparing memory to data/video) or a component failed. I have driven my GT3/GT3RSs with out experiencing anything close to this, even in wet conditions (obviously at far lower speeds).

I am glad you survived and hope your fiancee fully recovers quickly.